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R 형 열전대의 열처리 방법에 따른 알루미늄과 은 응고점에서의 기전력 변화
김용규,감기술 ( Yong Gyoo Kim,Kee Sool Gam ) 한국센서학회 1994 센서학회지 Vol.3 No.1
In order to investigate the effects of heat treatment on the thermoelectric motive force (EMF) of type R thermocouples, the changes of EMF in the freezing points of aluminum and silver cells were measured with the immersion depth of themocouples. With the variation of heat treatment methods before use, it was found that the EMF values were different from each other, maximum 17.1 ㎶ at 660.323℃ and 18.1 ㎶ at 961.78℃. Additionally a thermocouple, which was not heat-treated fully, showed an EMF difference with the immersion depth even though it was located on the region maintained at the constant temperature. The measured differences were about maximum 7.8㎶ at the Al freezing point and 18.9㎶ at the Ag freezing point. It was recongnized that a thermocouple for the precise temperature measurement should be heat-treated carefully before service. In this report, the proper heat treatment methods for the type R thermocouple were given on the basis of the obtained experimental results.
김용규(Yong-Gyoo Kim),김숙향(Sook Hyang Kim),양인석(Inseok Yang) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.11
We present experimental data on the time response behavior of industrial platinum resistance thermometers (IPRT) to help with the selection of proper sensors in industry and research laboratories. Time constants of IPRTs were measured using a method specified in ASTM standards. Two different sensors of different protecting sheath diameters were tested in air, water and silicon oil at temperatures from 0 °C to 200 °C. The time constant was the smallest in water and the highest in air. As the test temperature increased, time constants tended to decrease at all heat conducting media. For different diameters of sheath of IPRT at the same temperature, it was found that the IPRT of larger diameter showed higher time constant in air, but the opposite dependence was observed in water and oil. From the measured results, it was suggested that the sensor diameter and heat conducting medium should be considered if one wants to select proper thermometer to measure the dynamic temperature change in industry and research area.
김용규(Yong-Gyoo Kim),이석환(Seok Hwan Lee),김성훈(Sunghun Kim),양인영(Inyoung Yang) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
항공기 엔진 등 연소기의 표면온도는 연소성능과 관련된 중요한 측정인자 중의 하나이나 통상적인 온도측정 기술로는 연소화염이나 진동, 분진 등의 열악환경으로 인해 측정오차가 매우 큰 측정량이다. 이를 해결하기 위한 기술로 형광체의 온도에 따른 감쇠광의 파장변화 혹은 감쇠시간 변화를 이용하여 실시간으로 연소기 표면온도를 측정할 수 있는 기술이 개발되었다. 본 연구에서는 스크렘젯 연소기 내부 표면온도르르 in-situ 상태에서 측정할 수 있는 기술을 개발하기 위한 일환으로 355 nm 파장의 레이저로 여기된 Dy:YAG 형광체의 온도에 따른 분광특성을 최대 800 ℃까지 측정하였고, 전기로 내에서 교정된 열전대를 이용하여 형광온도계의 교정곡선을 구하였다. The surface temperature of a combustor such as an aircraft engine is one of the important measuring factors related to the combustion performance. However, a conventional temperature measurement technique have a large measurement error due to a bad environment such as a combustion flame, vibration, and dust. In order to solve this problem, a technology has been developed which can measure the surface temperature of the combustor in real time using the wavelength change or attenuation time change according to the temperature of the phosphor. In this study, we developed a technique that can measure surface temperature of scram-jet combustor using phosphor thermometry. The calibration curve was obtained according to the temperature from 200 ℃ to 800 ℃in the calibrated temperature chamber. So, we confirmed that phosphor thermometry can be used for measuring surface temperature of scram-jet combustor.
김용규 ( Yong Gyoo Kim ),감기술 ( Kee Sool Gam ) 한국센서학회 1995 센서학회지 Vol.4 No.2
Type K thermocouples having multi-junction for measuring the temperature gradient of the furnace were fabricated. The obtained results on the temperature gradient of the electric furnace maintained at 800℃ were consistent with those for the reference grade type 5 thermocouple, which was carefully calibrated, within the permitted error limit of the type K thermocouple. It was suggested that noble metal multi-junction thermocouples be suitable for more accurate temperature gradient measurements.
Pt/Pd 열전대의 실온보상을 위한 Cu-Ni 합금 개발
김용규 ( Yong Gyoo Kim ),강기훈 ( Kee Hoon Kang ),감기술 ( Kee Sool Gam ),이영희 ( Young Hee Lee ) 한국센서학회 2004 센서학회지 Vol.13 No.6
N/A Compensation wires for Pt/Pd thermocouple was manufactured using Cu/Ni alloys. Their thermoelectric voltage has been tested from room temperature to about 150℃. Alloys of Cu_(95.5) Ni_(4.5) and Cu_(89.5)Ni_(10.5) introduced only small emf differences to Pt/Pd thermocouples. indicating a real possibility of industrial use. Above 1000 ℃, the temperature difference was expected to he small as ±0.5 ℃, and the difference would be minimized by adjusting the Ni content with a small amount.